Redirecting underseat AC blowers

Discussion in 'Gen 4 Prius Main Forum' started by Jeff Gold, Sep 29, 2019.

  1. Jeff Gold

    Jeff Gold Junior Member

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    We've used a Toyota Prius since the first generation as our car of choice for safely transporting rescue animals for our dog rescue charity.

    This week we pickup our 2019 Prius Limited which will replace a 2012 Prius. We will keep the back seats permanently down, the back area is for rescue dogs, the front two seats for people.

    I've noticed with the seats down -- especially since we have a lot of items stored behind the two front seats -- little or no AC creeps up from the floor vents... so I had an idea to try this time...

    We would like to attach some sort of custom "mini-duct" to redirect AC air blowing from underneath the seats into a duct tube of some sort which would then come up in the center to the level just above the seats when they are folded down, so it would then blow to the back of the car above the folded seats, instead of just at the floor.

    Before I dive into experimenting, has anyone else ever tried this? Or have any suggestions before we try?

    Thanks!
     
  2. alanclarkeau

    alanclarkeau Senior Member

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    I'd test how the airflow is from them - that it's COLD - my last car which had rear floor vents (VOLVO) only sent heated air through them, but PRIUS might be different. Check it first.
     
  3. Jeff Gold

    Jeff Gold Junior Member

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    Great point. When I felt them at dealer they didn't seem to be putting out much cool air, but there was some flow. But maybe like you said they generally are more for heat? In which case we can just continue what we already do which is to rely on the front air vents blowing to the back and if really hot, we have a lighter-socket powered fan that sits in the middle helping the cool air get to the very back.

    Anyone else have experience with this?
     
  4. alanclarkeau

    alanclarkeau Senior Member

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    When I've got the grandchildren in the car (no not in the cargo area :eek:), they're comfortable. But I always direct my centre vents straight back and the two outer vents for the front passengers - I find that gives a better overall comfort level as the whole car cools more evenly rather than just air on my face.

    You'll want to turn ECO Climate Mode OFF - as it only sends air to the driver if there are no other passengers. Plus reduces air-cooling.

    NOTE - this is 2016, but I've got no reason to believe that it's changed for 2019. Come to think about it - I'm sure I've had cold air to my feet somehow, so it must be possible to fiddle with buttons and get cold to the back seats.

    upload_2019-9-30_11-43-57.png

    upload_2019-9-30_11-44-31.png upload_2019-9-30_11-44-51.png upload_2019-9-30_11-46-55.png

    upload_2019-9-30_11-48-34.png

    BUT - if you've got ECO on, and no passenger, this is what you get:
    upload_2019-9-30_11-49-36.png
     
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  5. Jeff Gold

    Jeff Gold Junior Member

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    I've been doing the same with my 2012 Prius. Directing the middle vents straight back. I actually close the two side vents to give the middle vents more "force" to send the air back. The 2019 Limited though, which we bought, has smaller vents to the side of the large screen so it won't be quite as good at sending that center vent air to the back, so checking out these other options. Thanks for the helpful diagrams for airflow, pretty sure this is nearly the same for the rear air vents in the 2019 we bought.
     
  6. kithmo

    kithmo Couch Potato

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    I would be careful about re-directing air flow from those lower vents, they help keep the HV battery cool. On a hot day you may have trouble with the HV battery overheating if there is not enough air going in to the vent on the lower part of the back seat. :cautious:
     
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  7. alanclarkeau

    alanclarkeau Senior Member

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    I don't think it'd cause a problem - they don't usually have any air-flow, and only generally if the car is being heated - 99.5% of my driving is alone, and nothing comes out of those vents unless I flick off ECO mode.
     
  8. hill

    hill High Fiber Member

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    Extra important to heed that advice - because the pack is only air-cooled. So the hotter it gets, the more important a sufficient volume crossing the battery's path becomes.
    .
     
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